90724331 has 4 divisors (see below), whose sum is σ = 90744072. Its totient is φ = 90704592.

The previous prime is 90724307. The next prime is 90724343. The reversal of 90724331 is 13342709.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90724331 - 2²² = 86530027 is a prime.

It is a super-2 number, since 2×90724331² = 16461808470795122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90724294 and 90724303.

It is not an unprimeable number, because it can be changed into a prime (90724531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055 + ... + 13511.

It is an arithmetic number, because the mean of its divisors is an integer number (22686018).

Almost surely, 2^90724331 is an apocalyptic number.

90724331 is a deficient number, since it is larger than the sum of its proper divisors (19741).

90724331 is a wasteful number, since it uses less digits than its factorization.

90724331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19740.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 90724331 is about 9524.9320732486. The cubic root of 90724331 is about 449.3394935396.

The spelling of 90724331 in words is "ninety million, seven hundred twenty-four thousand, three hundred thirty-one".